> > TP captures the video length from somewhere (?)
>
> Apparently it's a field in the video files named "xmpDM:duration" that contains the length in (thousandths of) seconds. Sadly, I can't get TP to auto-copy the values to a same-named user field in the database, or even just to show it in the metadata panel. I tried a user field named 'duration' as well.. no luck. I agree it would be very useful.
Yes, I found that field, too. But it won't even appear in the Metadata pane. The field is there, but no value, though that's true for almost all of the metadata in the list.
Thanks for trying, Daan, and replying so quickly. It helps.